348 Remarks on Certain Species of 



inFerussac's species (see fig. 1, p. 352), and though not referred 

 to in the description is distinctly shown in one of his figures; it 

 is entirely wanting in II. leporina, and also in the Darien shell 

 (fig. 2, p. 352). This groove is not only an externalcha racter, 

 but its presence modifies the internal structure of the shell. On 

 opening the base of the last whorl immediately behind the 

 aperture, a strongly developed transverse tubercle is seen 

 within, from which a strong ridge-like lamella runs round the 

 umbilical opening, corresponding in extent with the groove. 

 This tubercle, and the extension of it, are entirely disconnected 

 by a sinus or channel from the floor of the penult whorl. 



The hirsute character of this species is not alluded to by any 

 author. The outer edge of the peristome in specimens from St. 

 Augustine, is of a deep rose color. • 



In his " Notes on American Land Shells," Proc. Acad. Phil. 

 1857, Mr. "W. G. Binney gives St. Simon's Island and Savannah, 

 Ga., as habitats of II. leporina. He refers to the shells above 

 alluded to as to which we both were in error, and which we 

 have since determined to be II. pustula Fer. 



The measurements of a specimen of average size, are as fol- 

 lows: 



Diam. maj. 5, min. 4, alt. 2i, mill. 



For specimens of II. pustula from the neighborhood of 

 Savannah, I am indebted to Bishop Elliott, from St. Simon's 

 Island to Mr. Postell, and from St. Augustine, Florida, to Mr. 

 Dorman. 



Helix leporina Gould. 



Synonymy. 



Helix leporina Gould Proc. Bost. Soc. N. H. p. 39, 1848. 



" Binney Terr. Moll. II. p. 199, pi. xl. a fig. 1, 1851. 



Reeve Conch. Icon. No. 722, 1862. 

 pustula Pfr. var. Mon. III. No. 1575, 1853. 



